Verify that `ItemEnum` can be serialized and then deserialized using bincode

Cargo.lock

@@ -246,6 +246,15 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "bincode"
+version = "1.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b1f45e9417d87227c7a56d22e471c6206462cba514c7590c09aff4cf6d1ddcad"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -4351,6 +4360,7 @@ dependencies = [
 name = "rustdoc-json-types"
 version = "0.1.0"
 dependencies = [
+ "bincode",
  "rustc-hash",
  "serde",
  "serde_json",

src/rustdoc-json-types/Cargo.toml

@@ -12,3 +12,4 @@ rustc-hash = "1.1.0"
 
 [dev-dependencies]
 serde_json = "1.0"
+bincode = "1"

src/rustdoc-json-types/tests.rs

@@ -8,11 +8,15 @@ fn test_struct_info_roundtrip() {
         impls: vec![],
     });
 
+    // JSON
     let struct_json = serde_json::to_string(&s).unwrap();
-
     let de_s = serde_json::from_str(&struct_json).unwrap();
-
     assert_eq!(s, de_s);
+
+    // Bincode
+    let encoded: Vec<u8> = bincode::serialize(&s).unwrap();
+    let decoded: ItemEnum = bincode::deserialize(&encoded).unwrap();
+    assert_eq!(s, decoded);
 }
 
 #[test]
@@ -24,9 +28,13 @@ fn test_union_info_roundtrip() {
         impls: vec![],
     });
 
+    // JSON
     let union_json = serde_json::to_string(&u).unwrap();
-
     let de_u = serde_json::from_str(&union_json).unwrap();
-
     assert_eq!(u, de_u);
+
+    // Bincode
+    let encoded: Vec<u8> = bincode::serialize(&u).unwrap();
+    let decoded: ItemEnum = bincode::deserialize(&encoded).unwrap();
+    assert_eq!(u, decoded);
 }